UFO Sighting in Phoenix, Arizona on 2017-02-22 18:40:00 – 4 purple orbs witness and photographed by my son from an airplane over phoenix

My son saw 4 purple orbs hovering over phoenix arizona from his airplane window on 2/22/2017. out of the airplane window. it is not a reflection on the glass because the people in the seat in front of him spotted them first and then told him to look out. he snapped a picture. he witnessed them there 30 seconds and then vanished. his picture is a really good one and quite clear.